LOS ANGELES, Sept. 7 -- Gov. Arnold Schwarzenegger (R) announced Wednesday night that he will veto landmark legislation that would have allowed same-sex couples to marry. In a statement, Schwarzenegger's press secretary, Margita Thompson, said the governor opposes the legislation, passed Tuesday night by the California Assembly and last week by the state Senate, because he thinks the matter should be decided by California 's courts or its voters.By: By John Pomfret, WashingtonPost Staff Writer, Thursday, September 8, 2005; Page A04, Washingtonpost.com